Dec. 12, 1896: Marconi Demos Radio ? Dec. 12, 1901: Marconi Transmits Across Atlantic
On Dec. 12, 1986, Marconi amazed a London assemblage with wireless communication across a room. Five years later, he sent a signal across the Atlantic.
Source: http://www.wired.com/thisdayintech/2011/12/1212marconi-radio-demo-transatlantic/
